13215554451 has 24 divisors (see below), whose sum is σ = 20830794816. Its totient is φ = 8007009840.

The previous prime is 13215554449. The next prime is 13215554459. The reversal of 13215554451 is 15445551231.

13215554451 is a `hidden beast` number, since 1 + 3 + 2 + 155 + 54 + 451 = 666.

It is not a de Polignac number, because 13215554451 - 2¹ = 13215554449 is a prime.

It is a super-2 number, since 2×13215554451² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13215554459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342336 + ... + 378978.

It is an arithmetic number, because the mean of its divisors is an integer number (867949784).

Almost surely, 2^13215554451 is an apocalyptic number.

13215554451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13215554451 is a deficient number, since it is larger than the sum of its proper divisors (7615240365).

13215554451 is a wasteful number, since it uses less digits than its factorization.

13215554451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40303 (or 40300 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

It can be divided in two parts, 1321555 and 4451, that added together give a triangular number (1326006 = T₁₆₂₈).

The spelling of 13215554451 in words is "thirteen billion, two hundred fifteen million, five hundred fifty-four thousand, four hundred fifty-one".